Cargo Features
swc_ecma_transforms_proposal has no features set by default.
[dependencies]
swc_ecma_transforms_proposal = { version = "5.0.1", features = ["multi-module"] }- multi-module = swc_ecma_loader
Features from optional dependencies
In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.